package cn.tedu.v5;

import java.io.*;
import java.net.ConnectException;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

/**
 * 客户端：登录与消息广播不冲突 √ 退出
 */
public class Client {
    private Socket socket;
    private static final String Host="127.0.0.1";
    private static final Integer Port=4545;
    private PrintWriter pw;
    private BufferedReader br;
    public Client() {
        try {
            socket = new Socket(Host,Port );
            pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8")), true);
            br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
        } catch (NullPointerException e) {
            System.out.println("友情提示：IP传入错误导致链接失败~");
        } catch (UnknownHostException e) {
            System.out.println("友情提示：IP传入错误");
        } catch (ConnectException e) {
            System.out.println("客户端链接失败：建议检查IP或者端口号");
        } catch (IOException e) {
            System.out.println("客户端链接服务器失败：检查IP/端口");
        }
    }

    public void start() {
        //与服务器端交互---参考Server
        System.out.println("~~欢迎使用宇航牌QQ聊天室~~");
        Scanner input=new Scanner(System.in);
        try {
            //1.读入服务器端："请输入用户名："
            String serverMessage=br.readLine();
            //1.1显示“请输入用户名：”
            System.out.println(serverMessage);
            //1.2写出用户名
            String username=input.nextLine();
            //1.3用户输入的用户名--写出给服务器端
            pw.println(username);
            //2.1读入服务器端发给
            serverMessage=br.readLine();
            System.out.println(serverMessage);
            //2.2 用户输入--密码--写出给服务器端
            String password=input.nextLine();
            pw.println(password);

            //3.登录之后【登陆成功、登陆失败】--才可以聊天
            serverMessage=br.readLine(); //读入【登陆成功、登陆失败】
            System.out.println(serverMessage);
            //字符串方法：startsWith() 返回值 boolean 前缀名称一致true
            if (serverMessage.startsWith("登录成功")){
               //封一个客户端的：读写流---chat聊天
                chat();
            }

        }catch(IOException e){
            System.out.println("客户端断开连接！");
        } finally {
            if (pw != null)
                pw.close();
            try {
                if (br!=null)br.close();
            } catch (IOException e) {
                System.out.println("客户端关闭失败~");
            } if (socket != null && !socket.isClosed()) {
                try {
                    socket.close();
                } catch (IOException e) {
                    System.out.println("通讯关闭失败");
                }
            }
        }
    }
//封装一个针对聊天功能：读写 chat()
    private void chat(){
        new Thread(() -> {
            try {
                String message;
                while ((message = br.readLine()) != null) {
                    System.out.println("服务器端说：" + message);
                    System.out.println("客户端请输入：");
                }
            } catch (IOException e) {
                System.out.println("服务器端读入失败了！");
            }
        }).start();
        Scanner input = new Scanner(System.in);
        while (true) {
            System.out.println("客户端请输入：");
            String line = input.nextLine();
            pw.println("客户端说："+line); //发给服务器
            System.out.println("写出成功。");
        }
    }
    public static void main(String[] args)  {
        Client client = new Client();
        client.start();
    }

}

